LAB 10_VSEPR AND MOLECULAR MODELING PDF

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Lab Report for Lab that goes with the Chem Lecture....

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Experiment 011: VSEPR and Molecular Modeling References § Suzanne Slayden, 2018, Chemistry 213, 214, 272 Laboratory Experiments, 7th Edition, pages 101-107 § George Mason University, Department of Chemistry and Biochemistry. VESPR and Molecular Modeling; 2020 § VSEPR, Distance Learning Summer 2020, accessed via Blackboard Purpose The purpose of this experiment is to obtain the ability to visualize the three-dimensional structure of molecules through the use of the VSEPR theory. Materials § Molecular model kits § Periodic Table § Protractor Procedure Part 1 1. Using a molecular model set, choose the proper ball with the proper number and placement of holes needed. 2. Construct the figure by inserting rods into the homes and referring to the images in the lab manual. 3. Draw the molecular models that were constructed. 4. Measure the angles between all electron pairs with a protractor. 5. Determine the axial, equatorial positions and angles of the trigonal bipyramidal shapes. 6. Determine the two sets of angles on the octahedral shapes. 7. Record all data. Part 2

1. Using VSEPR theory, predict the geometry and construct models of molecules for the following central atoms: !"#!, $#" , %"&#, '#!, ()*" &! , and +&# )*. 2. The number of valence electrons in the molecule will need to be calculated and the Lewis electron dot structure will need to be drawn before lab. 3. Find the x and y values in the -.$ $% notation and determine the geometric arrangement of electron pairs for (x+y). 4. Use different colored balls to represent different atoms in each molecule model. Use single connecting rods to represent single bonds. Use a rod to represent nonbonded pairs. 5. Draw the molecule on the table in its accurate geometry and write the symbol for each pair of electrons. Part 3 1. Create models of two ()*# !/ , and draw them. 2. Draw the Lewis Dot Structures and make models for 0")*" !/, +&# )*! , and %"&!. Part 4 1. Use the Lewis Octet Rule and VSEPR to create possible Isomers for )" #& '. Observations The -.$ $% notation helped obtain the understating of the geometric arrangement. The periodic table was useful when determining the number of electrons were in nitrogen and hydrogen and it was easier to check the group numbers of each. The tetrahedral dimensionality was determined to be. A three-dimensional geometric shape. Atoms pointing north and south are axial and atoms pointing east, and west are equatorial.

Data table (attached):

Conclusion The purpose of this experiment was to obtain the ability to visualize the three-dimensional structure of molecules through the use of the VSEPR theory. The anticipated outcome was to determine the electron pairs on central atoms, Lewis structure, ball and stick model and the geometric arrangement of six molecules. The purpose was met, and molecular arrangements were constructed and their bond angles were determined. For future improvements of this experiment, part three could have more information to help determine the number of isomers needed to draw the structures....